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Complete the missing statements and give reasons. i) Metals are ……………………….., while non-metals are poor conductors of heat. ii) Metals are malleable, while nonmetals are ……………………….. . iii) Metals form positive ions, while nonmetals form ……………………….. . iv) Non-metals form acidic oxides, while metals form ……………………….. . |
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Answer» i) Good conductors. Reason : Metals containing free electrons are very good conductors of electricity whereas non-metals are bad conductors of electricity because they do not have free electrons. ii) Non-malleable. Reason : Metals are hard. So, they can be beaten into sheets whereas non-metals are soft, so they are non-malleable. iii) Negative ions. Reason : Metals are electropositive in nature. They easily lose electrons to form positive ions, whereas non-metals are electronegative in nature. So, they gain electrons to form negative ions. iv) Basic oxides. Reason : Non-metallic oxide solutions turn blue litmus into red. They are acidic in nature. So, they are called acidic oxides whereas metallic oxide solutions turn red litmus into blue. They are basic in nature. So, they are called basic oxides. |
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